Ordering the header files in the library's doxygen reference

I use quickbook and doxygen to create the doc for my library. In my 
jamfile for building the docs I have the header files in my doxygen 
reference listed in the particular order I would like to see them in the 
reference when the documentation is built. But for some reason I cannot 
discern the order of the header files in the reference section of my 
final HTML documentation is not the same as the order in which I have 
the header files listed.

Does anybody know how I can control the order of the header files listed 
in the reference section of my library's HTML documentation ?